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A. ElsELE 2,192,900

GAUGE Filed June 9. 1938 2 sheets-sheet 1 March 12, 1940.

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A. EISELE Mmh 12, 194o.

GAUGE Filed June 9, 1938 2 Sheets-Sheet 2 ffl Parenteel Mar. 1a, 1940UNITED N STATES PATENT @FFME '2,192,900 GAUGE Andrew Eisele, permit,Mich.

Application June 9, 1938, Serial No. 212,649 3 claims.' (o1. .s3-17s)taken in connection with the accompanying drawings in which:

Figure l is a view in side elevation of my improved gauge;

Fig. 2 is a side view of the gauge having parts broken away and insection;`

Fig. 3 is a View shown in cross section taken along the line and in thedirection of `the arrows 3-3 of Fig. 1;

Fig. 4 is a perspective viewof a detail part of the gauge;

.Fig 5 is a fragmentary view shown in section of a modication;

Fig. 5 is a fragmentary view of certain `parts of vthe device shownpartly in section and partly in elevation; y

Fig. 7 is'an end view taken in the direction of the arrows l-l' of Fig.6;

Fig. 8 is an end view taken in. the direction oi the arrows tl-t of Fig.6;

Fig. 9 is a view showing a modiiied form of the arrangement shown inFig. 6;

Fig. l is a perspective view of a part of the structure shown in Fig, 6;

Fig. 11 is a perspectivev view of a part of the structure shown in Fig.9;

Fig. l2 is a view in side elevation of a rod ernployed in the device,and

Fig. 13 is an end view of a modified form of gauge.

Referring to the drawings by characters of reference, the gauge includesan open ended tube it! on one end of which is mounted a feeler body .l Iand on the other end of which is mounted a gauge body ii., the body I2also serving as a handle for holding the instrument. The body H ispreferably anarrovv, generally cylindrical body for insertion in a boreto be tested and is provided with a bored recess It which is located offcenter of the body `and opens at one side thereof having a counterboreHi to receive one end of the tube it which abuts the internal out wardlyfacing shoulderof the counterbore. Surrounding the tube lil, a collar iis provided with a flange i5 having apertures to receive screws l1 forrigidly securing the collar and body Htogether and threaded into thecollar I5 is a set screw it engaging the tube lll to hold the same rigidto the collar and therefore rigid to the body Il.

The body l I is provided with a pair of spaced parallel bores Eil,transverse to bore i3, which open through the outer cylindrical surfaceof the body and slidably'receive and guide a pair of integral pins 2iwhich project externally ci the body i i and have their outer endsrounded, as at 22, for engagementwith the wall surface of a bore to betested. Below the bore i3, as seen in Fig. 3, the body il is hollowhaving a closure 23 formed in part by an inner wall 2li and an outeriiattened wall 25 and in the chamber 23 is a plate `rnen'lber 26 withwhich the guide pins 2i are integral. Through the and into the pins .2|longitudinally thereof are provided bores 21 to receive helical coilsprings 2S which at their lower ends seat and may be xed to the outerflattened wall 25, the springs yieldingly urging the pins 2i outwardly,limited by engagement of the plate Z5 withl the inner wall 24. Access tothe chamber may be had through an opening in a wall thereof, the openingbeing closed by a sliding closure plate 29, Fig. 2.

Threaded into the flattened outer body wall 2li is a threaded rod Siiwhich is positioned between. the pins 2l and extends in an oppositedirection thereto having its outer end rounded, as at di, to engage theWall surface of a bore. Threaded over the rod it is an open endedtubular inember one end of which. engages the body wall 25 locking the.threaded rod against movement relaof which is shown in may be providedto v accommodate bores oi various diameters. Thus the body l! carries ayieldably spring pressed member having two integral spaced Contactmembers and a relatively iixed contact member providing a three pointieeler member for insertion in a bore. As shown in 3 and 4. the plate 26may be provided vintermediats-te the pins 2l with a clearance apertureto receive the inner end of the .rod 39.

Between the spring pressed guide pins 2i, the body il is provided with abore 33 which at one end opens through the outer cylindrical surface of'the body and at .its other or inner end intersects the more ittransverse thereto. Slidably received and guided in the bore is areciprocal ieeler pin The feeler pin has one or its inner end projectinginto the bere i3 and its other or outer end projecting externally oi thebody, the outer end of the pin being rounded, as at 35, to decreasefriction with thewall surface of a bore to betested. The feeler member34 is limited in its reciprocal movement by a transverse pin 34a iiXedin the body and engaging in a slot 35h in the feeler member which keepsthe feeler member from falling out of the body.

The other body, or body i2, is provided with a bore 3b to receive an endportion of the tube Il! which is held thereto by a set screw 3i, thebore 3E having a reduced portion 38 provided with an outwardly facingshoulder against which the end of the tube abuts. Threaded into the bodyl2, a rod 3E! is locked against movement by a nut Mi screwed downagainst an outer wall of the body, and mounted on the rod 39, a guideand support M may be secured to the rod by a set screw 42. The body l2is provided with a bore i3 opening at one end thereof through one outerwall of the body and at its other end intersecting bore 34 transversethereto, the bore d3 slidably receivinga reciprocal pin dei. The pin tftprojects at one, or its inner end into the bore 3B and at its other endprojects externally of the body and abuts end to end with a reciprocalrod d5 which operates a gauge or indicator' et. The indicator shown is awell known device having a dial and movable pointer il which is biasedto zero reading by a spring (not shown). The reciprocal gauge rod [i5 isslidably received and guided in a tube or sleeve it held in an aperturein the support i! by a set screw Slg.

A rotatable shaft or rod 5@ operatively connects the feeler pin 3d andthe gauge operating pin M and is rotatably supported within the tube iiiby tubular inserts 5i which may be screwthreaded into opposite ends ofthe tube H5, End portions 52 and 53 of the shaft 5E are iiattenedproviding cams which respectively engage the lower end of the feeler pinand the lower end of the gauge actuating pince, the iiattened camportions or surfaces extending at relatively different angles. Asillustrated in Fig. 5 the feeler pin and also Y the gauge operating pinmay be provided with Q .rounded lower ends 55 to engage conical ends 5tof the rod 5B in which case the rod 5E! would be moved longitudinallyinstead of rotatably in transferring movement of the feeler pin to thegauge operating pin.

'Ihe aforementioned spring of the indicator E acts to rotate the rod ina direction to move the feeler pin t outwardly but to insure suchmovement I provide a tensioned leaf spring 56 secured at one end thereofto the body l2 under the nut dii, the other or free end of the spring 56abutting and acting downwardly on a shoulder 5I provided on the gaugeoperating pin da.

It will be seen that the herein described instrument can be very easilyand readily inserted in a bore to test the perfection of the same andthat any discrepancies will be readily indicated to the operator by theindicator M. In the testing of a bore for uniformity throughout itslength, a decrease in bore size is encountered, the feeler pin Sill willbe pressed inwardly of the body H rotating connecting rod 5E! which willmove pin it and rod i8 outwardly operating the gauge which readilyindicates the discrepancy in the bore size. Conversely, if the boretester is oversize, spring aided by the indicator spring will move pinfifi inwardly, rotating rod 5l! until limited by engagement of theieeler pin 3d with the wall of the bore, the error being indicated bythe indicator 636.

For deeper bores a longer tube 58, Fig. 6, and two connecting rods 59,may be connected together by an internally threaded open ended tubularmember 69 having a sliding fit with the inner wall surface of the tube.56. In Fig. 9 is showntwo outer tubes Sila and 6I connected together inendfto end abutting relation by an open ended tubular insert B2 threadedinto the opposed ends of the tubes and slidably receiving a connectingrod 63 which operatively connects the feeler member and gauge. From theabove it will be seen that any number of interchangeable tubes and rodsmay be employed for reaching into bores of various depths and that fordeeper bores the rods and their outer covering tubes may be joinedtogether as above pointed out.

In Fig. 13 is shown the feeler end of the device having instead oftherod 30, a micrometer to provide for accurate setting of the size boreto be tested. The micrometer is of the conventional so-called barreltype,

yWhat I claim is:

l. In a device for testing the uniformity of a bore, an open ended tube,a body mounted on one end of said tube for insertion in the bore, a pairof spaced integral contact members to engage the wall `surface of thebore, spring means urging said contact members outwardly of said body,an adjustable contact member carried by said body to engage the boresurface and extending therefrom in a direction opposite to said integralcontact memberaa body mounted on the other` `end of said tube, anindicator carried by said second-named body, a movable feeler membercarried by said first-named body to actuate said indicator, a rodslidably rotatable within said tube, and cam means on opposite ends ofsaid rod respectively engaging said feeler member and 'said movablemember. y

2. In a device for testing the uniformity of a bore, a tube, a bodymounted on one end of said tube for insertion in the bore, a feelermember to engage the bore surface and carried by and movable relative tosaid body, guide means carried by said body to engage the bore surface,a second body mounted on the other end of said tube, a gauge indicatormounted on said secondnamed body, a movable member in said secondnamedbody and operatively connected to said gauge, a rotatable connecting rodoperatively connecting said feeler member and said movable member, and`spring means acting to rotate said rod in a direction yieldablyopposingfrotation of the rod by said ieeler member.

3. In a device for testing the uniformity of av bore, a tube, a bodymounted in one end of said tube for insertion in the bore, a feeiermember to engage the bore surface and carried by and movable relative tosaid body, guide means carried by said body to engage the bore surface,a second body mounted on the other end of said tube, a gauge indicatormounted on said secondnamed body, a movable member in said secondnamedbody and operatively connected to said gauge, said movable member beingmovable transversely of said tube, a rotatable rod in said tube andhaving flattened end portions at relatively different angles radial tothe longitudinal axis of said rod, said attened portions providing cammeans respectively engaging said movable member and said feeler member.

ANDREW EISELE.

